EP2087265A2 - Electrovalve - Google Patents
ElectrovalveInfo
- Publication number
- EP2087265A2 EP2087265A2 EP07825500A EP07825500A EP2087265A2 EP 2087265 A2 EP2087265 A2 EP 2087265A2 EP 07825500 A EP07825500 A EP 07825500A EP 07825500 A EP07825500 A EP 07825500A EP 2087265 A2 EP2087265 A2 EP 2087265A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- slider
- plunger
- solenoid valve
- fluid
- inlet duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
- F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A solenoid valve comprises a hollow body (2); an inlet duct (3) to allow the inflow of a fluid into the hollow body (2); an outlet duct (4) to allow the outflow of the fluid from the hollow body (2); a plunger (8) located in the hollow body (2) and reversibly movable between a closed position in which it prevents the transit of the fluid from the inlet duct (3) to the outlet duct (5), and an open position in which it allows the transit of the fluid from the inlet duct (3) to the outlet duct (5); and a slider (9) for activating the plunger (8) on which a pressure is exercised by the fluid in the inlet duct (3). The solenoid valve furthermore comprises means (12) of compensating the pressure exercised on the slider (9) which, in response to a command for opening the plunger (8), originate a pressure on the slider (9) which counteracts said pressure exercised on the slider (9) by the fluid in the inlet duct (3).
Description
"Electrovalve"
The present invention has as its subject a solenoid valve which has an application in apparatuses where there is a need to regulate a flow of water or water vapour. In particular the present invention has an application in steam boilers used in domestic electrical appliances such as, for example, machines for the production of coffee or ironing systems . Solenoid valves of known type comprise a main body made, for example, out of brass, into which flows an inlet union connectable to a boiler of a domestic electrical appliance. Inside the above- mentioned inlet union is formed a duct through which a fluid is made to flow into the inside of the solenoid valve. Similarly, the main body is connected to an outlet union inside which is formed a duct for the outflow of the fluid. Inside the main body is arranged a plunger which, when actuated by a control device, regulates the transit of fluid from the inlet duct to the outlet duct. This control device comprises a cylindrical slider (or nucleus) connected coaxially and rigidly to the plunger, and an electromagnetic coil. In
detail, the plunger is dragged by the slider in such a way as to open or close the passage between the inlet and outlet ducts.
Solenoid valves of known type are normally closed and are opened when a user requires fluid. However, there exist solenoid valves which operate according to an opposite principle. In this case, the solenoid valves are normally open and are closed as required. Around the stem is located an electromagnetic coil for moving the slider. In detail, when the solenoid valve is to be opened, the coil is supplied and generates an electromagnetic field which acts on the slider. Since the slider is made of ferromagnetic material, the slider is lifted and drags the plunger which liberates the passage between the inlet duct and the outlet duct. When the flow is to be closed, the supply to the coil is suspended and a return spring lowers the slider. The plunger therefore returns to prevent the passage of fluid.
Solenoid valves of known type however have a number of disadvantages.
First of all, the slider is subject to a pressure difference which is opposed to the electromagnetic force necessary for its lifting. In fact, inside the hollow cylindrical body in which the slider runs is the fluid under pressure, while the end in which the housing for the plunger is formed is subject to the outlet pressure which is less than the inlet pressure. In this way, in addition to the energy expended in lifting the slider and the plunger, it is necessary also to supply the energy for opposing the force generated by the above-mentioned pressure difference . Furthermore, generating an additional force for cancelling out the force on the slider produced by the pressure difference causes a delay in the response of the solenoid valve.
An object of the present invention is therefore to provide a solenoid valve which resolves the above- mentioned disadvantages.
In particular, it is an object of the present invention to provide a solenoid valve in which the above-mentioned pressure difference is reduced or
eliminated, consequently requiring a lesser quantity of electricity for activating it. Furthermore, it is an object of the present invention to propose a solenoid valve with a limited delay in response.
Further characteristics and advantages will appear more clearly from the detailed description of a preferred, but not exclusive, embodiment of a solenoid valve according to the present invention. This description will be set forth below with reference to the attached drawings, provided solely for indicative and therefore not limiting purposes, in which: figure 1 shows an exploded perspective view of a solenoid valve according to the present invention; figures 2, 3 and 4 each represent a sectional view of the solenoid valve shown in figure 1, in three distinct operating conditions. In accordance with the above-mentioned figures, No. 1 indicates a solenoid valve in accordance with the present invention.
Solenoid valve 1 includes a hollow body 2 into which flows an inlet duct 3 to allow the inflow of
a fluid such as, for example, water or water vapour. In more detail. Solenoid valve 1 includes an inlet union 4 which forms at least in part the inlet duct 3. Similarly, from hollow body 2 flows an outlet duct 5 through which the above-mentioned fluid exits. In detail, solenoid valve 1 includes an outlet union 6 which forms at least in part the outlet duct 5. Inside hollow body 2, inlet duct 3 at least partially overlaps outlet duct 5. Inlet duct 3 is in communication with outlet duct 5 through a communicating orifice 7.
Solenoid valve 1 includes a plunger 8 located inside hollow body 2 and movable between a closed position in which it prevents the transit of the fluid from inlet duct 3 to outlet duct 5, and an open position, in which it allows the transit of the fluid from inlet duct 3 to outlet duct 5. In more detail, in the closed position plunger 8 obstructs orifice 7, while in the open position plunger 8 keeps this orifice 7 free and the fluid can pass freely.
Solenoid valve 1 also includes a slider (or nucleus) 9 for activating the plunger 8, slidably
movable inside a closing stem 10. This stem 10 consists of a hollow cylindrical body which is screwed onto hollow body 2 for closing solenoid valve 1. Between stem 10 and hollow body 2 is a gasket 11 which ensures the closure seal. Advantageously, stem 10 can be made of plastic material .
Solenoid valve 1 furthermore includes means 12 for compensating the pressure. In fact, between slider 9 and stem 10 there is fluid at the pressure of the inlet fluid. However, the pressure in the outlet duct 5 is acting over a base surface 9a of slider 9 facing plunger 8. In this way, a pressure difference acts on slider 9 which generates a force opposing the lifting of slider 9 and therefore opposing the opening of solenoid valve 1.
The compensating means 12 acting on slider 9 thus produce a cancelling-out of this force. In more detail, compensation means 12 include a cage 13 which coaxially connects slider 9 to plunger 8.
Cage 13 consists of a tubular body and has a first end 13a connected to slider 9 and a second end 13b connected to plunger 8.
Slider 9 has a groove 14 which extends circumferentially over a lateral surface 9b.
Cage 13 has edges bent inwards in proximity to its first end 13a which engage in groove 14 in such a way that the above-mentioned base surface 9a of slider 9 is enveloped by cage 13. In this way, cage 13 can slide with respect to slider 9 coaxially with the latter.
Cage 13 also has bent edges in proximity to its second end 13b which rigidly clasp plunger 8. Slider 9 can therefore move closer to and further from plunger 8.
Plunger 8 with cage 13 and slider 9 can assume different configurations during the use of solenoid valve 1. In the closed configuration (figure 2) of solenoid valve 1, plunger 8 is in its closed position and therefore prevents the outflow of fluid, while slider 9 is in contact with plunger 8.
In the open configuration (figure 4) of solenoid valve 1, plunger 8 is in its open position and slider 9 is distanced from plunger 8.
When the command to open the solenoid valve is given, during the transition between the closed configuration and the open configuration, slider 9 and plunger 8 assume an intermediate configuration
(figure 3). In this further configuration, plunger
8 is in its closed position, while slider 9 is distanced from plunger 8.
In the intermediate configuration, compensation means 12 are activated on slider 9 and include a compensation chamber 15 formed by plunger 8, base surface 9a of slider 9 and cage 13 itself. Compensation chamber 15 is in fluid communication with inlet duct 3 by bypassing through openings 16 formed in proximity to ends 13a, 13b of cage 13. In this way, before plunger 8 is lifted, leaving orifice 7 free, compensation chamber 15 is filled with fluid at the pressure in the inlet duct 3. At this point, the whole of slider 9 is subject to the same pressure, and the pressure difference mentioned above is cancelled out.
Solenoid valve 1 also includes an electromagnetic coil 17 located around stem 10 which acts on slider
9 to set it in motion. In more detail, when the command to open the solenoid valve 1 is given, coil 17 is supplied and generates an electromagnetic field. This field originates a force on slider 9, which is lifted.
When solenoid valve 1 is to be closed, the supply to the coil 17 is suspended, and slider 9 is thrust downwards by a return spring 18 inserted into stem
10 and acting on a base surface 9c of slider 9 opposite to base surface 9a which faces plunger 8. Advantageously, cage 13 can be made of a plastic material. By way of example, cage 13 can be made of polyetheretherketone (PEEK), or of liquid crystal polymer material.
The invention achieves the proposed objects and obtains important advantages. First of all, once the opening command is given, compensation chamber 15 is formed, into which flows fluid at the pressure of inlet duct 3. The above- mentioned pressure 'difference is thus cancelled out, and consequently the force opposed to the opening of solenoid valve 1 is also cancelled out.
In consequence, the energy required for moving slider 9, and therefore for opening solenoid valve 1, is reduced.
Furthermore, since it is no longer necessary to provide energy also for opposing the force deriving from the pressure difference, the opening of solenoid valve 1 ends up being faster and the delay in response of solenoid valve 1 is consequently reduced. One advantage attributable to solenoid valve 1 according to the present invention relates to the fact that some of its components, like cage 13 and stem 10, can be made in plastic material. This characteristic allows the overall weight of the solenoid valve 1 to be reduced, and it also entails a simplification of the production process for these components.
Claims
C L A I M S l.A solenoid valve comprising: a hollow body (2); - an inlet duct (3) to allow the inflow of a fluid into the hollow body (2);
- an outlet duct (4) to allow the outflow of the fluid from the hollow body (2); a plunger (8) located in the hollow body (2) and reversibly movable between a closed position in which it prevents the transit of the fluid from the inlet duct (3) to the outlet duct (5), and an open position in which it allows the transit of the fluid from the inlet duct (3) to the outlet duct (5); and a slider (9) for activating the plunger (8) on which a pressure is exercised by the fluid in the inlet duct ( 3 ) ; characterised by comprising furthermore means (12) of compensating the pressure exercised on the slider (9) which, in response to a command for opening the plunger (8), originate a pressure on slider (9) which counteracts said pressure exercised on slider (9) by the fluid in the inlet duct (3) .
2. A solenoid valve according to claim 1, wherein the compensation means (12) comprise a compensation chamber (15) in fluid communication with the inlet duct (3); the chamber (15) being formed by a base surface (9a) of the slider (9) facing the plunger (8), by the plunger (8) and by a cage (13) which envelopes the base surface (9a) and the plunger (8) .
3. A solenoid valve according to claim 2, wherein the cage (13) has at least one opening
(16) to allow fluid communication with the compensation chamber (15).
4. A solenoid valve according to claim 2, wherein the cage (13) is coaxially interposed between the slider (9) and the plunger (8) and is rigidly connected to the plunger (8) and slidably connected to the slider (9) .
5. A solenoid valve according to claim 2, wherein the slider (9) has a groove (14) formed in one lateral surface (9b); the cage (13) engaging in the above-mentioned groove (14).
6. A solenoid valve according to claim 2, wherein the cage (13) is made of polyetheretherketone .
7. A solenoid valve according to claim 2, wherein the cage (13) is made of liquid crystal polymer material.
8. A solenoid valve according to any of the preceding "claims, comprising furthermore a stem
(10) within which runs at least the slider (9); the stem (10) being made in plastic material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000016U ITMI20130016U1 (en) | 2007-10-18 | 2013-01-16 | ELETTROVALVOLA |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT002042A ITMI20062042A1 (en) | 2006-10-24 | 2006-10-24 | ELETTROVALVOLA |
PCT/IB2007/003222 WO2008050227A2 (en) | 2006-10-24 | 2007-10-18 | Electrovalve |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2087265A2 true EP2087265A2 (en) | 2009-08-12 |
Family
ID=39273423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07825500A Withdrawn EP2087265A2 (en) | 2006-10-24 | 2007-10-18 | Electrovalve |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2087265A2 (en) |
DE (1) | DE202007019292U1 (en) |
IT (1) | ITMI20062042A1 (en) |
WO (1) | WO2008050227A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20092204A1 (en) * | 2009-12-16 | 2011-06-17 | Ceme Spa | MULTI-MATERIAL SOLENOID VALVE |
EP2921753B1 (en) * | 2014-03-21 | 2017-06-28 | Safran Aero Boosters SA | Aerospace solenoid valve for high-pressure cryogenic gas |
DE102015200072A1 (en) * | 2015-01-07 | 2016-07-07 | Continental Teves Ag & Co. Ohg | Valve seat carrier |
DE102017207208A1 (en) * | 2017-04-28 | 2018-10-31 | Robert Bosch Gmbh | Valve for adjusting a fluid flow |
IT202100024896A1 (en) * | 2021-09-29 | 2023-03-29 | Emerson Automation Fluid Control & Pneumatics Italy S R L | SOLENOID VALVE |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003045352A2 (en) * | 2001-11-21 | 2003-06-05 | Alza Corporation | Osmotic delivery device having a two-way valve and dynamically self-adjusting flow channel |
FR2852301A1 (en) * | 2003-03-13 | 2004-09-17 | Valois Sas | Aerosol device for distributing a liquid product, especially a pharmaceutical product, is produced from high performance synthetic materials rather than aluminum |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3797526A (en) * | 1972-08-21 | 1974-03-19 | E Champeon | Cage valve with pilot and mechanical operating means |
FR2706566B1 (en) * | 1993-06-16 | 1995-09-01 | Sagem Allumage | Valve for a solenoid valve, and a circuit for recycling petrol vapors comprising such a valve. |
FR2713302B1 (en) * | 1993-12-01 | 1996-03-01 | Eaton Sa Monaco | Liquid distributor working with solenoid valves. |
DE19529724A1 (en) * | 1995-08-12 | 1997-02-13 | Teves Gmbh Alfred | Solenoid valve, in particular for hydraulic motor vehicle brake systems with wheel slip control |
DE29706717U1 (en) * | 1997-04-14 | 1997-07-17 | Buerkert Werke Gmbh & Co | Broadband valve |
DE29912814U1 (en) * | 1999-07-22 | 1999-12-02 | Buerkert Werke Gmbh & Co | Dispensing system for fuel pumps |
NO312114B1 (en) * | 2000-05-22 | 2002-03-18 | Paul Tengesdal | Valve for regulating fluid flow |
-
2006
- 2006-10-24 IT IT002042A patent/ITMI20062042A1/en unknown
-
2007
- 2007-10-18 DE DE202007019292U patent/DE202007019292U1/en not_active Expired - Lifetime
- 2007-10-18 EP EP07825500A patent/EP2087265A2/en not_active Withdrawn
- 2007-10-18 WO PCT/IB2007/003222 patent/WO2008050227A2/en active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003045352A2 (en) * | 2001-11-21 | 2003-06-05 | Alza Corporation | Osmotic delivery device having a two-way valve and dynamically self-adjusting flow channel |
FR2852301A1 (en) * | 2003-03-13 | 2004-09-17 | Valois Sas | Aerosol device for distributing a liquid product, especially a pharmaceutical product, is produced from high performance synthetic materials rather than aluminum |
Also Published As
Publication number | Publication date |
---|---|
ITMI20062042A1 (en) | 2008-04-25 |
WO2008050227A2 (en) | 2008-05-02 |
WO2008050227A3 (en) | 2008-07-17 |
DE202007019292U1 (en) | 2012-01-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20090521 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20090904 |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20120530 |
|
110E | Request filed for conversion into a national patent application [according to art. 135 epc] |
Effective date: 20120807 |